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2026/09/24

Case 04 | 100-guest conference — the biggest risk isn’t ‘no car’, it’s ‘someone running the old version’

The Scenario

A large corporate event needs pickup and drop-off for around 100 guests.

The project starts with an Excel sheet:

Guest nameFlightHotelVehicleDriver

The client keeps changing things via WeChat group:

Guest A changes flight
Guest B cancels
Guest C arrives one day earlier
Guest D changes hotel
Guest E adds a companion

The project team keeps editing the Excel.

Here’s the problem:

Someone is working from V3
Someone is working from V5
A driver in the WeChat group is even sharing a screenshot of V2.

What happens next?

Even if everyone is being very careful, you may end up with:

A driver going to the airport for an old flight
A dispatcher believing the guest has cancelled
The client thinking the vehicle has been changed
The driver never receiving the update

Eventually everyone asks the same question:

“Wait — which version is the right one?”

What’s the real issue?

It’s not a lack of communication.

It’s:

No single source of truth.

Complex conference ops cannot treat WeChat group messages as the execution source.

WeChat groups are good for:

Communicating changes.

But the final execution info must return to:

The unified master sheet.

A More Reliable Mechanism

Every change must complete this chain:

  1. Client proposes the change
  2. Project manager confirms it
  3. Master sheet is updated
  4. Status is changed
  5. Relevant drivers are notified
  6. Driver acknowledgement is received

Only when this chain is complete is the change truly “in effect.”

A Very Important Principle

Chat logs are an event record, not the final truth.
The master sheet is the current truth.

The Rule This Case Produced

Large conference projects should always have:

Single Source of Truth
One latest version

Every driver, dispatcher, and customer-service agent must execute against this one copy.